How severe is CVE-2019-12806?

CVE-2019-12806 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12806 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12806?

CVE-2019-12806 affects Crosscert Unisign. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12806?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-12806 published?

CVE-2019-12806 was published on 2019-08-13 and last updated on 2026-06-17.

CVE-2019-12806

CVE-2019-12806 is a high-severity vulnerability in Crosscert Unisign with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Crosscert Unisign
Published: 2019-08-13
Last modified: 2026-06-17

Description

UniSign 2.0.4.0 and earlier version contains a stack-based buffer overflow vulnerability which can overwrite the stack with arbitrary data, due to a buffer overflow in a library. That leads remote attacker to execute arbitrary code via crafted https packets.

Frequently asked questions

What is CVE-2019-12806?: UniSign 2.0.4.0 and earlier version contains a stack-based buffer overflow vulnerability which can overwrite the stack with arbitrary data, due to a buffer overflow in a library. That leads remote attacker to execute arbitrary code via crafted https packets.
How severe is CVE-2019-12806?: CVE-2019-12806 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12806 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12806?: CVE-2019-12806 affects Crosscert Unisign. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12806?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-12806 published?: CVE-2019-12806 was published on 2019-08-13 and last updated on 2026-06-17.

References

https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35111

Affected products (1)

cpe:2.3:a:crosscert:unisign:*:*:*:*:*:*:*:*

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